Page 68 - Gas Detection Systems Training Manual

Wire Sizing (Power):
0 to 500 feet wire length; recommend wire gauge size 16 AWG 501 to 1000 feet wire length; recommend wire gauge size 14 AWG Safety Interrupt (mains circuit breaker):
A circuit breaker or interrupt switch for overcurrent protection rated for 30 watts located in the mains supply circuit is recommended. It should be located near the device it is protecting and labeled.
To minimize the length of exposed conductor, strip wires to 3/8 inch. Solder tin the exposed wire to increase durability.
Protective bonding is provided by an internal screw location for connection of a grounding wire. Installation of this wire should include the use of a locking feature (i.e. locking washer).
Conduit:
1For hazardous location installations seals must be installed within 18 inches of conduit entries.
The SEC3120 has three (3) 3⁄4” NPT threaded ports for mounting and wiring the sensor(s) and transmitter into a permanent installation.
Field wiring connections are made on the backside of the SEC3120 printed circuit board (PCB). For connection details refer to Figure 1.
Shielded cable is recommended. Wiring should be installed in metal conduit with no other cabling in the same conduit.
Operator Manual Page 7 of 40 P/N 1580281 SEC3120 Digital Transmitter Sensor Electronics Corporation Rev 10, 20150707